Resonant and nonresonant funneling through plasmonic gratings in the limit of the aperture width approaching zero
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2014-01-13
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M. J. Bloemer et al., Resonant and nonresonant funneling through plasmonic gratings in the limit of the aperture width approaching zero, Applied Physics Letters, Volume 104, Issue 2, 1103 (2014), https://doi-org/10.1063/1.4861850
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain Mark 1.0
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
We experimentally and theoretically investigate electromagnetic funneling in thick plasmonic gratings as the aperture size approaches zero. Both resonant and nonresonant funneling mechanisms were observed to provide near unity transmission for aperture widths of ∼λ/100. As the apertures become smaller, the resonant funneling process enters into a region of strong absorption followed by complete reflection. In sharp contrast, the broadband, nonresonant funneling mechanism continues to transmit energy at high levels for screens of <1% open area and apertures sizes as small as λ/1500 before finally transitioning to a completely absorbing state without any abatement of the funneling into the apertures.